Method of tempering molders&#39; sand.



No. 762,597. PATENTED JUNE 14, 1904.

G. W. PAGKER, DECD. u. A. noun. ADMINISTBATRIX.

METHOD OF TBMPERING MOLDERS SAND. APEgIOATIOIILEIgIULY 10. 1901. nmmwnn90121, 1908.

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" ATTORNEYS PATENTED JUNE 14, 19-04.

'GQW. PAGKER, DEOD. I. A. PAGKER. ADMINISTBATRIX. METHOD OF TEMPERINGMOLDERS SAND. APPLICATION FILED JULY 10. 1991. RENEWED OCT. 21, 1903.

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PATENT OEEIcE.

- GEORGE W'. PACKER, OF CHICAGO, ILLINOIS; MARGARET A. PACKERADMINISTRATRIX OF SAID GEORGE PACKER, DECEASED.

METHOD OF TEMPERING IVIOLDERS SAND,

SPECIFICATION forming part of Letters Patent NO. 762,597, dated June 14,1904. Application filed July 10,1901. Renewed October 21,1903. SerialNo. 177,946.. (No specimens-l To all whom, it may concern:

Be it known that I, GEORGE IV. PAOKER, a citizen of the United States,residing at Chicago, in the county of Cook and State of Illinois, haveinvented a certain new and useful Method of Tempering Molders Sand, ofwhich i ticity; and the invention has for its object to subjectsubstantially every grain or particle of the sand to the same amount ofmoisture, whereby the sand will be tempered uniformly throughout andwill be entirely free from the dry clots and oversoaked portions thathave heretofore made mechanical tempering means ob ectionable andinduced foundrymen as a rule to adhere to hand tempering methods.

IVith these ends in view the invention consists in the features ofnovelty, wh ch will now be specifically described, reference being hadto the accompanying drawings, showing a form of apparatus for carryingthe process into effect.

In the said drawings, Figure 1 is a vertical longitudinal sectional viewof the apparatus by which the method may be performed; Fig. 2 is a plansection of the tempering chamber or compartment, showing the screeningdevice therein; and Fig. 3 is a transverse sectional view thereof, takenon the line 3 3, Fig. 2.

In carrying out my method I subject the sand to the action of steam,preferably in a substantially closed chamber and while the sand is in astate of agitation preferably while the sand is being showered into saidchamber-so that the individual grains 0: particles will becomeintimatelycommingled with the steam and condense a sufficient portion of the steamon theirindividual surfaces to give the sand as a mass the desireddegree of dampness and plasticity without producing in the least degreeany surplus or free moisture.

It is desirable to retemper the sand after each molding operation, so asto restore thereto the amount of moisture evaporated and driven off bythe heatof the metal and by contact with the atmosphere during themolding operation, and to this end it is preferable to employ ascreening device into which the molds and the castings may be depositedand which will serve to separate the sand from the castings and enablethe sand to be retempered by the action of the steam while the mold isbeing disintegrated in the separating or screening operation.

In the drawings is shown a hopper 1, into which the mold M, containingcastings, may be depositedand which hopper leads into a tumbler 2,composed of a number of parallel bars arranged in the form of a cylinderand with spaces between them and slightly inclined, so that as thecylinder is revolved the sand will be shaken through the spaces betweenthe bars, while the castings will work out at the lower end of thetumbler or cylinder. This tumbler 2 is surrounded by a screen 3, also ofcylindrical form, but of a finer mesh than the spaces between the barsof the tumbler 2, and into which cylindrical screen fall the sand andthe core-wires. The core-wires work out at the lower end of the screenand may be conducted away by the chute 3 or in any other suitablemanner, while the sand falls in a shower into a casing or chamber 4,which also preferably incloses the screening device just described. Thescreening device may be mounted in this chamber I and provided withmeans of rotation in any suitable way. The drawings show the ends of thecylindrical screen provided with rims 5, which rest upon four rollers 6,arranged in pairs on shafts 7 8, respectively, the shaft 7 being drivenby a train of gears 9 from a driving shaft 10, having pulleys 11,adapting it'to be connected by belt to any suitable source of power.

Through one side of the chamber or casing t projectsone or moresteam-nozzles 12, which may be connected to any suitable surce of steamand which nozzles are directed across the showering sand, so as to servenot only for moistening the sand, but for more disintegrating andintimately commingling the sand with the steam.

On the side of the chamber 4: opposite the nozzles 12 is arranged aninclined trough 13, which catches and conducts away the water ofcondensation running down the side of the chamber, where it is impingedby the steam jets, a similar trough 14: being located on the other sideto catch any drip that may occur there. tom of chamber 4 it will besubstantially retempered; but in order that it may remain at the bottomof the chamber a short while longer and yet not accumulate there it isgradually worked out of the chamber 4: by any suitable conveyer into astoring-hopper 15, which may be provided with a gate or valve 16 at thebottom for drawing off the sand as desired.

The form of conveyer shown consists of a reciprocating bar 17,havinganumber of pivoted paddles 18 which scrape the sand in onedirection, but pass over it when going in the other direction, and thusserve to pull the sand out of chamber 4 and keep it level and evenlydistributed in hopper 15. "he bar 17 is supported by swinging hangers19, and it is reciprocated by crank 20, connected to the bar by pitman21 and operated by worm-wheel 22 and worm-shaft 23.

By this method it will be seen that the fine particles of sand will beintimately commingled with the steam, and even though they should not besufliciently cold to condense any material amount of the steam on theirindi- By the time the sand reaches the bot' vidual surfaces while withinthe steam-cham ber the requisite amount of steam nevertheless will beintimately commingled with the sand throughout the entire mass, andwhenever it does chill or is subjected to the external atmosphere itwill turn into moisture, and the moisture will be at the proper pointsthroughout the entire bulk to temper the sand uniformly withoutoversoaking or leaving any dry clots.

Having thus described my invention, what I claim as new therein, anddesire to secure by Letters Patent, is

1. The herein-described method of tempering sand which consists inshowering the same through a forced stream of steam and catching thetempered sand and free water of condensation separately, substantiallyas set forth;

2. The herein-described method of tempering sand which consists inshowering the same through a forced stream of steam shooting in onedirection only and catching the free water of condensation at the end ofthe stream separately from the tempered sand, substantially as setforth.

3. The herein-described method of tempering sand which consists insubjecting the same to the action of steam and keeping the tempered sandand the free water of condensation separate, substantially as set forth.

GEORGE W. PACKER.

Witnesses:

F. A. HOPKINS, D. (J. GRIMELL.

